From b40442ba88fec5e64ab1802ce37df0afec59fa53 Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Sun, 6 Oct 2019 05:36:44 -0700 Subject: [PATCH] bpo-38383: Fix possible integer overflow in startswith() of bytes and bytearray. (GH-16603) (cherry picked from commit 24ddd9c2d6ab61cbce7e68d6de36d4df9bd2c3fb) Co-authored-by: Hai Shi --- Objects/bytes_methods.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Objects/bytes_methods.c b/Objects/bytes_methods.c index 07842f746910..7c8ea815494e 100644 --- a/Objects/bytes_methods.c +++ b/Objects/bytes_methods.c @@ -757,7 +757,7 @@ tailmatch(const char *str, Py_ssize_t len, PyObject *substr, if (direction < 0) { /* startswith */ - if (start + slen > len) + if (start > len - slen) goto notfound; } else { /* endswith */ -- 2.47.3